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Posted by / 08-Jan-2017 04:58

Updating indexes for block

If you prefer to attempt to retrieve the record first, you can use query, the database will return any rows that correspond to your query.

Peewee makes this possible, too, but since Peewee models form a graph (via foreign-keys), the selected data is returned as a graph of model instances.This section will provide a quick overview of some common types of expressions.There are two primary types of objects that can be composed to create expressions: Note In SQLite, foreign keys are not enabled by default.Most things, including the Peewee foreign-key API, will work fine, but ON DELETE behaviour will be ignored, even if you explicitly specify on_delete to your Foreign Key Field.In conjunction with the default Primary Key Field behaviour (where deleted record IDs can be reused), this can lead to surprising (and almost certainly unwanted) behaviour where if you delete a record in table A referenced by a foreign key in table B, and then create a new, unrelated, record in table A, the new record will end up mis-attached to the undeleted record in table B.

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For this example we’ll use some different models in a that deactivates all user accounts whose registration has expired.